diff --git a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Device.java b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Device.java
index 0114ac3..7fd7b80 100644
--- a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Device.java
+++ b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Device.java
@@ -4,6 +4,7 @@ import ch.usi.inf.sa4.sanmarinoes.smarthut.config.GsonExclude;
 import com.google.gson.annotations.SerializedName;
 import io.swagger.annotations.ApiModelProperty;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Set;
 import javax.persistence.*;
 import javax.validation.constraints.NotNull;
@@ -91,4 +92,8 @@ public abstract class Device {
         this.kind = kind;
         this.flowType = flowType;
     }
+
+    public List<Trigger<? extends Device>> triggeredTriggers() {
+        return List.of();
+    }
 }
diff --git a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/InputDevice.java b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/InputDevice.java
index 2acf0c2..0623872 100644
--- a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/InputDevice.java
+++ b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/InputDevice.java
@@ -1,9 +1,12 @@
 package ch.usi.inf.sa4.sanmarinoes.smarthut.models;
 
+import ch.usi.inf.sa4.sanmarinoes.smarthut.config.GsonExclude;
+import java.util.HashSet;
 import java.util.Set;
 import javax.persistence.Entity;
 import javax.persistence.Inheritance;
 import javax.persistence.InheritanceType;
+import javax.persistence.OneToMany;
 
 /**
  * A generic abstraction for an input device, i.e. something that captures input either from the
@@ -12,6 +15,10 @@ import javax.persistence.InheritanceType;
 @Entity
 @Inheritance(strategy = InheritanceType.JOINED)
 public abstract class InputDevice extends Device {
+    @OneToMany(mappedBy = "scene", orphanRemoval = true)
+    @GsonExclude
+    private Set<Trigger<? extends Device>> triggers = new HashSet<>();
+
     public InputDevice(String kind) {
         super(kind, FlowType.INPUT);
     }
diff --git a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Thermostat.java b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Thermostat.java
index 7c54d54..dc8b977 100644
--- a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Thermostat.java
+++ b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/models/Thermostat.java
@@ -1,9 +1,15 @@
 package ch.usi.inf.sa4.sanmarinoes.smarthut.models;
 
+import ch.usi.inf.sa4.sanmarinoes.smarthut.config.GsonExclude;
 import com.google.gson.annotations.SerializedName;
 import java.math.BigDecimal;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
 import javax.persistence.Column;
 import javax.persistence.Entity;
+import javax.persistence.OneToMany;
 import javax.persistence.Transient;
 import javax.validation.constraints.NotNull;
 
@@ -24,6 +30,7 @@ public class Thermostat extends Switchable {
 
     /**
      * Computes the new thermostat state, for when the thermostat is on;
+     *
      * @return true if the state changed, false if not;
      */
     public boolean computeState() {
@@ -75,12 +82,21 @@ public class Thermostat extends Switchable {
 
     @Column private boolean useExternalSensors = false;
 
+    @OneToMany(mappedBy = "scene", orphanRemoval = true)
+    @GsonExclude
+    private Set<BooleanTrigger<? extends Device>> triggers = new HashSet<>();
+
     /** Creates a thermostat with a temperature sensor and its initial OFF state */
     public Thermostat() {
         super("thermostat");
         this.mode = Mode.OFF;
     }
 
+    @Override
+    public List<Trigger<? extends Device>> triggeredTriggers() {
+        return triggers.stream().filter(t -> t.check(this.isOn())).collect(Collectors.toList());
+    }
+
     public void setMode(Mode state) {
         this.mode = state;
     }
diff --git a/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/service/DeviceService.java b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/service/DeviceService.java
new file mode 100644
index 0000000..c843c42
--- /dev/null
+++ b/src/main/java/ch/usi/inf/sa4/sanmarinoes/smarthut/service/DeviceService.java
@@ -0,0 +1,36 @@
+package ch.usi.inf.sa4.sanmarinoes.smarthut.service;
+
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.Device;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.DeviceRepository;
+import ch.usi.inf.sa4.sanmarinoes.smarthut.models.Trigger;
+import java.util.List;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+@Component
+public class DeviceService {
+
+    /*
+    Automation entity
+    - name
+    - id
+    - Set<Trigger>
+    - OrderedList<Scene> // define order of application of scenes of the automation
+      // separate AutomationWithOrder id entity:
+      // - application_order_id (1 for first, 2 for second)
+      // - scene
+      // - FK automation
+     */
+
+    @Autowired DeviceRepository<Device> deviceRepository;
+
+    public <T extends Device> T save(T device) {
+        List<Trigger<? extends Device>> activated = device.triggeredTriggers();
+
+        // map activated -> automations
+        // remove duplicates
+        // sort automations per priority
+        // sort scenes inside automations per priority
+        // apply scenes (SceneService.apply())
+    }
+}